Type-writer lock mechanism.



M. M. BLUM.

TYPE WRITER LOCK MECHANISM.

APPLICATION FILED SEPT. 1 I. 1915.

1,174,305. I Patented Mar.7,1916.

UNIVERSAL BAD.

ammo a MILTON M. BLUM: WHWHLQ: v

sen,

. To all whom it may concern:

' a typewriter so that any manipulation or movement of the latter can be positively prevented not only during the shipment of the machine but when the machine is in service and the operator desires to prevent tampering with it in his or her absence.

The chief object of my present invention is to take advantage of certain features of construction which are characteristic of the majority of typewriters in making effectual the locking of both the type bar levers and the carriage, and both of these ends are preferably attained in my invention by means of a single lock which is permanently attached to the typewriter frame.

One feature of my invention relates to the design of the key actuated locking member for the parts to be locked and I propose to design this member .so that in its locked position it will embrace the parts it operates so as to itself constitute a means for efiectually securing the lock against detachment from the typewriter. In other words, the lock bolt, which as shown is in the form of a bent rod, is adapted to so engage the carriage or the line lock bail, or both the carriage and the line lock bail, that in its locked position it will constitute a part of the attaching means for the lock itself which would hold the lock even if its attaching means to the frame were removed.

In connection with the locking of the type bar levers and the other key controlled functions of the typewriter, I propose to adapt my key actuated lock to engage and lock the universal bar and in accomplishing this, as a preferred means, I have designed my lock means to engage the line lock bail and force the latter into position to lock the universal bar for by this means I obtain a positive lock of the universal bar without subjecting the key controlled mechanism to any appreciable strain.

In connection with the locking of the carriage I have designed a lock element 1 mime 31mm, orfnmmmeiinmhnhnnm.

Specificationof Letters Patent:

PE-mm MK,

" BatentedMar. "7, 1916.

, Application filed September 11, 1515. seamen... 50,267.

which is bent to engage under and be braced by the overhanging side flange of the machine top and is movable from rear to front of the machine toengage a part of the carrlage, preferably the depending draw strap stud and thus hold the .carriage against movement.

My invention further comprisesthe novel details of construction and arrangement of parts which in their preferred embodiment only are hereinafter morev particularly described and illustrated by reference to the accompanyingdrawings which form a part of this specification, and in which Figure 1 is a side elevation of an L. C. Smith typewriter which'I have chosen to illustrate my invention but without intending thereby to limit myself to such type of machine. Fig. 2 is a perspective view of the lock mechanism with the typewriter parts shown with which it operates in performing its locking function. Fig. 3 is a detail internal view of the lock with its front cover removed. Figs. 4 and 5 are de- Eail views .of the yoke ends on the locking Similar reference numerals refer to similar parts throughout the drawings.

the customary arrangement of type bar levers 6 connected by sub-levers 7 to the several type bars 8 which are adapted to strike the platen 9 mounted upon a movable carriage 10, which parts are all of standard construction and form no particular part of my present invention. The typewriter is provided with a 'universal bar 11 of standard construction mounted upon a bracket 12 and having exposed to the rear of it a line lock bail 13 suitably pivoted to brackets 14 at its rear corner edges and provided along its length with slots 15. \This line lock bail is adapted when rocked by its operating bell crank (not shown) to engage and lock the universal bar so as to hold it in position to lock the type and control bar levers of the machine against manipulation. The carriage has rigidly mounted thereon a depending draw strap stud 16 to which the carriage draw strap 17 is attached. It

will be noted that the strap leaves a substantial portion of the stud exposed above it so that it is peculiarly adapted to serve as the part to be engaged by my lock to prevent the movement of the carriage. All of the parts so far described are of standard construction and need no modification to be adapted to my present purposes.

lily lock mechanism comprises a casing 18 having an integral or a soldered top plate 19 and having an extension flange 20 at one end which laps over the rear face of the side plate and is intended to be riv eted or permanently attached thereto with the lock barrel 21 seated in the lower rear corner of the center opening in the side plate which thus braces the lock against displacement and atfords a firm attachment for it to the frame. The lock, which is the type described in my pending application, Serial No. 13,931, need not be described in detail in this case beyond stating that it comprises aslide 22 which is provided with an arcuate slot in which a pin 2-1, disposed eccentric to the key rotated portion of the lock, is received and as the lock is turned the pin will shift the slide from full to dotted line position, as shown in Fig. 3, and

vice versa. A lock bar 25 is made last to the slide and passed through suitable openings in each end of the casing 18. The rear end of this lock bar, designated as 25, constitutes the type bar lever locking element.

,It is bent inwardly crosswise of the machine and upwardly and has its end bent toward the front of the machine where it provided with a yoke 26 comprising an elongated bottom arm '27. The yoke arms are provided with alining slots 28 in which a headed pin 29 is slidably received. lhis yoke is adapted to straddle the line lock bail 13 with the pin 29 passing through the slot 15 therein. The lower arm 27 of the yoke passes under the line lock bail and into position to engage and lock the universal lllll 11 when the. yoke stands in the full line position shown in Fig. :2. At the same time the-upper arm of the yoke will engage and force downwardly the line lock bail so as to move the latter into position to lock the universal bar and thus take the direct thrust r strain as the locking arm 25.

The forward end of the locking bar, which is designated as 25, constitutes the carriage locking element and is provided with an outward bend 30 therein which brings it to a point outside of the side plate 3 of the frame. T he arm is then bent rearwardly and upwardly, forming an inclined portion 31 which at its upper end is turned straight up and brought under the overhanging ilange 5 of the top adjacent to the side and is there bent outwardly to form a loop 32 which brings the locking bar just under the lower lip of the flange 5, whereupon the bar is bent up at 33 and again bent over at 3% to overlie the top 4 and to extend crosswise of the machine to a point opposite the draw strap stud 16 when the carriage is in the middle position. The arm is then bent up at 35 and bent forward horizontally at 36 and provided at its end with a yoke 37, the arms of which lie horizontally and are adapted to receive between them the stud 16 and thereby to lock the carriage against lateral movement.

it will be noted that when the key actuated locking bar is thrown into operating or locked position with its yoke member 37 pressed against the carriage pin 16 and the yoke 26 and arm 27 pressed against the line lock bail and universal bar, it will prevent the lock frame from being shifted to the left suiliciently for its flange 20 to clear the frame, inasmuch as the frame itself will prevent the lock being shifted to the right,

even after the retaining rivets are withdrawn, the locking bar, which may he broadly considered as the key actuated looking bolt, will serve in its locked position to hold the lock casing fast in position in the frame.

In operation, to unlock the typewriter, the turning of the lock will shift the yokes 26 and 3? simultaneously rearwardly, thus releasing the draw strap stud 16 of the carriage and also both the universal bar and the line lock bail, leaving the latter free to assum its upright position. The typewriter is then free for use. To lock it, the key controlled movement will advance the yokes forwardly, the yoke 37 embracing the stud l6 and the yoke 26 not only engaging and locking the universal bar but also forcing the line lock bail into locked position behind the bar.

The particular manner of constructing the locking arm for the carriage has in view to provide the maximum brace from the frame itself, but it will be obvious that this may .bewvidely varied so long as the carriage lock is operable from the typewriter lock and adapted to move it into engagement with a suitable part of the carriage. in like manner the particular construction of the universal bar lock may be varied and it may be used separately or in combination with the carriage loci; and it may also be adapted to loci; the universal bar without reference to the line lock bail or, by shortening the yoke arm 27, to lock the universal bar solely through the instrumentality of the line lock bail.

With these modifications in mind, what I desire to secure by Letters Patent, is

l. The combination with a typewriter having movable parts, of a key-controlled loch adapted to be attached to the typewriter and havin a bolt formed of an elongated rod shape to engage and lock one or" said movable parts and when so engaged to prevent the detachment of the lock from the typewriter.

2. The combination with a typewriter having type bar levers and a universal bar, of a key controlled lock rigidly attached to the typewriter, and a bent bar actuated as a bolt by the lock and disposed in position to engage and lock the universal bar and through it the type b'ar levers.

3. The combination with a typewriter havin a universal bar, a line lock bail and type at levers, of a key controlled lock rigidly attached to the typewriter, having means actuated by the key to engage and lock the universal bar and to move and hold the line lock bail in position to cooperate with said means in looking the universal bar.

4. The combination with a typewriter having a universal bar and a line lock bail,

of a key controlled lock rigidly attached to the typewriter, having means actuated by the key comprising a yoke member adapted to straddle the line lock bail and, in one operating position, to force the 'bailinto position to lock the universal bar and, in its other position, to leave the bail and uni-- versal bar free for normal manipulation.

5. In a typewriter the combination of a universal bar and a line lock bail having a slot therein, with a key-controlled lock permanent'ly attached to the typewriter, havin a bolt bar .provided with a yoke at one en and a vertical pin loosely mounted thereon which is passed through the slot in the bail, the yoke being adapted to straddle and force {the bail into position to lock the universal 6. The combination with a ty ewriter frame and a carriage thereon, of a ey-controlled lock permanently attached f to the frame having a bolt bar operable by the key and'movable thereby toward and from the carriage, and a yoke on said bar adapted to.

straddle a permanent part of the carriage Y and lock the latter.

frame and a carriage thereon, of a key con-.

7. The combination with a typewriter trolled lock rigidly. attached to the frame, having a locking arm operable by the key adapted to straddle a portion of the carriage and lock the latter, substantially as described.

8. The combination of a typewriter frame having a top plate with down turned side edges, a carriage movable transversely across the top of the rame having a stud thereon, a

key controlled lock attached to the frame,

said lock having a rod operable by the key and bent to provide an intermediate loop portion which engages under the overhanging side edge of the top of the frame, and a yoke on the end of said arm which is adapted to straddle said stud on the carriage to lock the latter, substantially as described.

9. The combination with a typewriter having a carriage, a universal bar and type bar levers, of a key controlled lock permanently attached to the typewriter, said lock having means operable by the key to simultaneou'sly lock the carriage and the universal bar against movement, substantially as described.

10. A typewriter locking mechanism comprising a key lock having a' bolt member ada ted to straddle and move into locking position with a line lock bail.

11. A typewriter locking mechanism comprising a key lock havin a bolt member provided with a yoke wh1ch is adapted to embrace a portion of the typewriter carriage and lock it against movement.

12. A typewriter key locking mechanism adapted to be attached toa typewriter and having a bolt member adapted to simultaneousl engage the carriage controlled line lock bail and the carriage and lock them against movement in either direction.

13. The combination with a typewriter having-a carriage and a-means for lockin the. type bar levers, of akeycontrolled 10c mounted on the typewriter, having members, I disposed to engage and lock both the type writer carriage and said type bar locking means, said members when in locked position being adapted to hold the key controlledtypewr'iter having a lock' bolt comprising a rod having yokelikev members at each end adapted'to engageandinterlock with a plurality of the movable typewriter elements which it is desired to lock against movement.

15. The combination wlth a typewriter v having a carriage and type bar lever locking means-of a key lock having a casing shouldered to seat in a corner of the typewriter frame and-overlap behind the bottom and side edge thereof, and abolt dis osed to engage said carriage and said 100 g means and positivel -hold said casing in engagement with said frame.

In testimony whereof I aflixm signature.

4 MILTON BLUM.

' Witness: s Nam WELSH.. 

